eNET: Fix CONFIG_SYS_HZ to be 1000

The clock interupt has always been 1kHz as per timer_init() in
/arch/i386/cpu/sc520/sc520_timer.c
Signed-off-by: NGraeme Russ <graeme.russ@gmail.com>

include/configs/eNET.h

@@ -140,7 +140,7 @@
 
 #define	CONFIG_SYS_LOAD_ADDR		0x100000	/* default load address	*/
 
-#define	CONFIG_SYS_HZ			1024		/* incrementer freq: 1kHz */
+#define	CONFIG_SYS_HZ			1000		/* incrementer freq: 1kHz */
 
 /*-----------------------------------------------------------------------
  * SDRAM Configuration